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Agenda: 2/19

Agenda: 2/19. Warm-up: Origin of the Elements Review of Radioactive Isotopes Half Life Calculations Fission and Fusion Mole Practice. Review: Isotopes. What does the “235” in Uranium-235 mean? What is another way to represent the isotope Uranium -235?

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Agenda: 2/19

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  1. Agenda: 2/19 • Warm-up: Origin of the Elements • Review of Radioactive Isotopes • Half Life Calculations • Fission and Fusion • Mole Practice

  2. Review: Isotopes • What does the “235” in Uranium-235 mean? • What is another way to represent the isotope Uranium -235? • How do Carbon-12 and Carbon-14 differ?

  3. Review: Radioactive Isotopes A radioactive isotope has an __________nucleus that undergoes _____________ changes. • Emits particles • 1. • 2. • Emits energy in the form of __________ waves. • Transmutates (changes) into another element

  4. Fill in the missing symbols & identify the type of particle emitted

  5. Answers

  6. Write a balanced nuclear equation for each decay process indicated. • a. The isotope Th-234 decays by an alpha emission. • b. The isotope Fe-59 decays by a beta emission

  7. Answers

  8. Half life Calculations • How much of a 100g sample of an unstable isotope remains after 25 years if the half life is 5 years? • Determine how many “half life intervals”. • Calculate the amount of original sample remaining after each ½ life • Simplify the calculations • 100g

  9. Half Life Problems • How much of a 60g sample of an unstable isotope remains after 2 days if the half life is 12 hours? 7.5 g

  10. Half Life Problems • How much of a 20 g sample of an unstable isotope remains after 3 sec if the half life is 0.5 seconds?

  11. Nuclear Fission – Example: Catawba Nuclear Energy Plant – Lake Wylie For Student notes:

  12. Nuclear FusionExample: Sun’s (Star’s) Energy

  13. Origins of Element Reading Analysis:

  14. Teachers' Domain: The Origin of the Elements

  15. Teachers' Domain: The Elements: Forged in Stars

  16. Moles: a counting unit in chemistry • Mole calculation review & practice • Molar Mass of Compounds

  17. Mole Flow Chart Gas volume Mass Mole Atoms Compounds

  18. Practice problems: Moles and Mass • What is the mass of 0.5 moles of S? • How many grams is equivalent to 0.137 moles of Fe? • 4.63 mol P = ? grams P

  19. Practice problems • How many moles are in 84.3 grams of Si? • 50 grams of Ne = ? moles of Ne

  20. Mole and Atom Conversions • How many atoms of Al are in 2.5 moles? • How many atoms of Ag are in 0.26 moles? • How many atoms of He are in 0.0023 moles?

  21. Moles and Volume (Gases only) • How many Liters of He are in 0.023 moles? • How many moles are in 60 L of Neon?

  22. Molar Mass of Compounds • NaOH H₃PO₄ • H₂O PCl₃ • MgCl₂ H₂SO₄

  23. Mole Conversion of Compounds • How many grams are in 5 moles of CO₂? • How many atoms are in 5 moles of CO₂? • How many liters are in 5 moles of CO₂?

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